Relief followed by catastrophic doubt is the very nature of OCD. But don't beat yourself up for confessing, it's how we learn. Take a deep breath. Accept that you're in for some discomfort, as hard as that is. Gently turn you attention to an action that you find meaningful - exercise, reading, your favourite show, housework...whatever. Those thoughts are going to creep in. Expect it. Accept it. Keep doing what you're doing. Resist the temptation to text your gf to see if everything is ok. Sit with the discomfort and keep doing what you're doing. I know how unbelievably impossible that sounds. Only a couple of weeks ago I really believed it to be impossible. Now I realise its not only possible, its helpful. Those troublesome thoughts are learning that they are irrelevant. Don't fixate on real relationship worries vs OCD. Real relationship worries are often very normal. The OCD sticks them under a magnifying glass and says A-HA! That's why I'm having these thoughts. When in reality, it's very natural and normal to have relationship troubles. Park those thoughts for now and focus on working through your OCD. You can't possibly make a decision about the future of your relationship while your mind is overly fixated on the negative. I hope that helps.
That really helps, thank you
Something that helps me is to remember that intuition is a calm, neutral, all-knowing feeling. There’s no feelings of anxiety involved in intuition.